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'OFPTFEATUREREQUEST' is sent by Openflowplugin when a switch connects as part of initial handshake. Could you explain your use case? Do you want to send feature request after connection establishment or are you writing your own controller from scratch? I can't think of any other reason where you would want to send this message from an application.

If you're still interested, take a look at openflowplugin code that sends this message. It should be using some openflowjava APIs to send this message.